Leases - Reconciliation of Future Undiscounted Cash Flows to Operating and Finance Leases (Details) - USD ($) $ in Thousands	Oct. 31, 2019	Apr. 30, 2019
Operating leases
2020	$ 11,866
2021	21,887
2022	15,758
2023	11,384
2024	10,227
Thereafter	34,047
Total lease payments	105,169
Less imputed interest	(13,649)
Total lease liability	91,520
Current maturities	(19,453)	$ 0
Lease liability - long-term	72,067	0
Lease assets	89,662	$ 0
Financing leases
2020	1,300
2021	2,142
2022	1,205
2023	803
2024	763
Thereafter	176
Total lease payments	6,389
Less imputed interest	(302)
Finance Lease, Liability	6,087
Current maturities	(2,320)
Lease liability - long-term	3,767
Lease assets	$ 10,431